I can understand the reboot of Batman Series, but I cannot understand why Hulk was rebooted and now why do we have to reboot Spider-man?

Is it they are not able to write script in the same back-drop as the previous movies in the series? Is it because they are not able to write sequels or prequels that will not conflict with the story already told in the previous movies?

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David StrattonJul 7 '12 at 1:44

I honestly think this is a good question. I did a little digging and found that Spider Man 4 was planned, but was scrapped in order to do the reboot. I wasn't able to find any prevelant information as to why SM4 was cancelled.
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DForck42Jul 7 '12 at 3:31

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I think this could be a good question, if it's cleaned up to focus specifically on Spider-Man, and not reboots in general.
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FlimzyJul 7 '12 at 6:47

2 Answers
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[...] Sony Pictures decided today to reboot the Spider-Man franchise after franchise director Sam Raimi pulled out of Spider-Man 4 because he felt he couldn’t make its summer release date and keep the film’s creative integrity.

[...] The events that led to today’s shocking decision to scrap Spider-Man 4 can be traced to mid-December when I saw a December 11th email alerting the pic’s special effects crew that the fourquel would not be starting as planned ”but Sam Raimi has story issues [that] need to be resolved before we are ready to shoot”.

At that point, it wasn’t well known that the Spider-Man franchise director helming the 4th installment had huge problems with the script that has run through screenwriters Jamie Vanderbilt, David Lindsay-Abaire, and Gary Ross. I was told Sam Raimi had been very vocal inside Sony that he “hated” it.

Isn't also another reason, is if Sony do not continue making Spider-Man movies they lose the rights to the Spider-Man IP? I don't have sources for that, but probably read some where from other SE questions.
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JaredJul 11 '12 at 2:30

The reason behind The Hulk's reboot is the negative reviews of the film (Its a different fact that some of people like me liked the old Hulk movie more). And the new Hulk film is also made up his entry in Marvel cinematic universe.

For case of Spider-man Sony and Rami's Clashes are the reason for cancelling Spider-man 4 and then Sony decided for a reboot to save the lose of copyrights of spider-man films. See here for details.